Add client support for bearer token authentication

lib/client.js

@@ -501,13 +501,16 @@ Request.prototype.accept = function(type){
  * Set Authorization field value with `user` and `pass`.
  *
  * @param {String} user
- * @param {String} pass
- * @param {Object} options with 'type' property 'auto' or 'basic' (default 'basic')
+ * @param {String} [pass] optional in case of using 'bearer' as type
+ * @param {Object} options with 'type' property 'auto', 'basic' or 'bearer' (default 'basic')
  * @return {Request} for chaining
  * @api public
  */
 
 Request.prototype.auth = function(user, pass, options){
+  if (typeof pass === 'object' && pass !== null) { // pass is optional and can substitute for options
+    options = pass;
+  }
   if (!options) {
     options = {
       type: 'function' === typeof btoa ? 'basic' : 'auto',
@@ -523,6 +526,10 @@ Request.prototype.auth = function(user, pass, options){
       this.username = user;
       this.password = pass;
     break;
+
+    case 'bearer': // usage would be .auth(accessToken, { type: 'bearer' })
+      this.set('Authorization', 'Bearer ' + user);
+    break;  
   }
   return this;
 };